ReO4- AND TcO4- ION-SELECTIVE BUBBLE-THROUGH FLOW CELLS

A fast-response flow cell with ion-selective electrodes was constructed for continuous-flow measurements in air-segmented streams without debubbling. The flow system was optimized for perrhenate and pertechnetate determinations. With a flow-rate of 4 ml min(-1) a sampling rate of 480 h(-1) was achieved for ion determinations; the average relative standard deviation in all instances was better than 3%. In order to eliminate the operation of removing bubbles with debubbler and to obtain the rapid sampling rates in conventional air-segmented system, bubble-through flow cells without different bubble-gating methods have been proposed in this report for Tc and Re tetraoxometallate anion determination.